Fill-Trol and Watts B911S-M3 Hot Water Boiler Fill on same system. Is that normal?

loborr

My gas hydronic boiler has a pressure reducing boiler fill valve and it also has an Amtrol Fill-Troll (combination expansion tank and automatic, pressure-reducing fill valve). Is this necessary or can I eliminate the fill-troll valve since I have a Watts boiler fill valve/pressure reducer? (of course I would keep the expansion tank)

The reason I am asking is that it appears that the actual valve for the fill-troll is either sticking shut or broken and it is not allowing water into the system. I would just replace the amtrol-fill troll valve but I can't find one because the one on my boiler is oriented to allow the amtrol fill-troll expansion tank to install horizontally. The only ones I have seen on the internet are for a vertical installation and that would not work with my current system due to piping and space. Thanks to anyone that can help with this question.

Paul S_3

Remove the whole fill trol assembly. ....install new expansion tank, you must check the new expansion tank with a tire pressure gauge it should be at 12 psi....if your system fill pressure requires more pressure you must pump it up with a bicycle pump..
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loborr

Thanks for the response Paul. Is there a reason I can't use the existing expansion tank without the fill troll valve?